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| author | Lu Baolu <baolu.lu@linux.intel.com> | 2021-08-18 21:48:48 +0800 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2021-08-19 10:41:08 +0200 |
| commit | 289b3b005cb9d9dd6b30297b52c2b4596bc878b2 (patch) | |
| tree | fbbfa6ceb84862eeeb8be20af160039658b14b24 /drivers/iommu/mtk_iommu_v1.c | |
| parent | 792fb43ce2c98878f1539c1d3fdecc1d7a7d78fd (diff) | |
iommu/vt-d: Preset A/D bits for user space DMA usage
We preset the access and dirty bits for IOVA over first level usage only
for the kernel DMA (i.e., when domain type is IOMMU_DOMAIN_DMA). We should
also preset the FL A/D for user space DMA usage. The idea is that even the
user space A/D bit memory write is unnecessary. We should avoid it to
minimize the overhead.
Suggested-by: Sanjay Kumar <sanjay.k.kumar@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20210720013856.4143880-1-baolu.lu@linux.intel.com
Link: https://lore.kernel.org/r/20210818134852.1847070-6-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/mtk_iommu_v1.c')
0 files changed, 0 insertions, 0 deletions